The sound of jackboots clattering on the pavement would fill the air .

军靴在人行道行走时发出的咔嗒声充斥在空气中。

Once more , the dover mail struggled on , with the jackboots of its passengers squashing along by its side .

多佛邮车，连同跟在它旁边的乘客们的溅起泥水的长靴，又在挣扎前进。